Single-Storey Extensions in South Wales
A single-storey extension is the most popular way to add real space to a family home — most often to extend the kitchen, create an open-plan kitchen-diner, or add a new lounge. We provide a full design-and-build service from initial drawings and Building Regs through to brickwork, roofing, glazing and finish. Most single-storey extensions complete in 8–14 weeks and many fall under permitted development.
Benefits
- Real Family Space: Add 15–35 m² of properly built, fully insulated living space to your home.
- Design-and-Build Service: We handle architect drawings, Building Regs and the full build — one team, one point of contact.
- Often No Planning Needed: Many single-storey rear extensions are permitted development under the larger home extension scheme.
- Premium Glazing Included: Aluminium bifolds, sliding doors or roof lanterns built into the quote from day one.
- Fixed Written Quote: No open-ended costs — we provide a detailed itemised quote with stage payments.
- Adds Significant Value: A well-designed single-storey extension typically returns 70–100% of its cost on resale.
Our single-storey extensions range
- Rear Single-Storey Extension: The classic — extend straight out the back to enlarge the kitchen or lounge.
- Side Single-Storey Extension: Use under-utilised side return space, especially on Victorian and Edwardian terraces.
- Wrap-Around Single-Storey Extension: Combine rear and side extensions into one L-shaped open-plan family room.
- Single-Storey Extension with Lantern: Flat-roof extension topped with a glass lantern for dramatic natural light.
Frequently Asked Questions
Do I need planning permission for a single-storey extension?
Many single-storey rear extensions fall under permitted development — up to 6m on a detached house and 4m on a semi/terraced under the larger home extension scheme. We confirm planning status before quoting.
How long does a single-storey extension take to build?
Most single-storey extensions are completed in 8–14 weeks from groundworks to handover.
How much does a single-storey extension cost?
Typically £1,800–£2,800 per m² depending on spec, glazing and finish — so a 25 m² extension is usually £45,000–£70,000. Fixed quotes after detailed survey.
Free Quote in 24 Hours — We Beat Any Like-for-Like Quote
Get a fixed-price quote within 24 hours. Free home survey. 10-year guarantee. Call 02920 860894 or request a callback.